Best Diesel Cars in the UK (2026)
Ranked by MOT pass rate from 26,791,426 real diesel car tests. Reliability and running costs based on actual DVSA data.
Updated March 2026. 2512 diesel models analysed.
81%
Avg diesel pass rate
£1,706
Avg annual cost
148p/L
Current diesel price
Diesel cars remain popular with high-mileage drivers thanks to superior fuel economy on long runs. A small diesel doing 55 mpg will save hundreds per year over a petrol equivalent if you regularly cover motorway miles. The key risk with diesels is the DPF: short urban journeys can clog it, leading to expensive repairs and MOT failures.
Below are the most reliable diesel cars on UK roads, ranked by their first-time MOT pass rate. We also show the cheapest diesels to run overall.
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Top 20 Most Reliable Diesel Cars
Ranked by MOT pass rate, with estimated annual running costs
| # | Car | Pass Rate | Total/yr | |
|---|---|---|---|---|
| 1 | Bentley Bentayga(2019) | 98% | £1,690 | |
| 2 | Bentley Bentayga(2018) | 97% | £1,690 | |
| 3 | Bmw 118(2022) | 97% | £1,482 | |
| 4 | Peugeot Expert S L1 Bluehdi(2020) | 97% | £1,350 | |
| 5 | Land Rover Range Rover Westmnstr D Mhev A(2021) | 97% | £1,690 | |
| 6 | Porsche Macan(2017) | 96% | £1,690 | |
| 7 | Honda Hr-v(2020) | 96% | £1,350 | |
| 8 | Land Rover R Rover Sprt Hse Slvr D Mhev A(2021) | 96% | £1,690 | |
| 9 | Land Rover Defender Hard Top D Mhev Auto(2021) | 96% | £1,690 | |
| 10 | Land Rover Defender Se D Mhev Auto(2021) | 96% | £1,690 | |
| 11 | Bentley Bentayga(2017) | 96% | £1,690 | |
| 12 | Land Rover Defender S D Mhev Auto(2021) | 96% | £1,690 | |
| 13 | Fiat Ducato(2021) | 96% | £1,690 | |
| 14 | Land Rover Range Rover Evoque Se D Mhev A(2021) | 96% | £1,482 | |
| 15 | Mercedes G(2020) | 96% | £1,690 | |
| 16 | Ford Kuga St-line X Ed Eblue Mhev(2021) | 96% | £1,482 | |
| 17 | Land Rover Defender First Ed D Mhev Auto(2021) | 96% | £1,690 | |
| 18 | Audi Q8(2020) | 96% | £1,690 | |
| 19 | Audi Sq5 Vorsprung Tdi Quattro Auto(2020) | 96% | £1,690 | |
| 20 | Volkswagen Tiguan Elegance Tdi 4motion Sa(2021) | 96% | £1,482 |
Cheapest Diesel Cars to Run
Sorted by total annual running cost. Small-engine diesels with high pass rates dominate this list.
Top 10 Cheapest Diesels to Run
Lowest estimated annual running costs, diesel only
| # | Car | Pass Rate | Total/yr | |
|---|---|---|---|---|
| 1 | Seat Ateca(2016) | 91% | £1,295 | |
| 2 | Mini Paceman(2016) | 91% | £1,295 | |
| 3 | Volkswagen Golf(2016) | 90% | £1,295 | |
| 4 | Audi A3(2016) | 90% | £1,295 | |
| 5 | Honda Cr-v(2015) | 90% | £1,295 | |
| 6 | Mini One(2016) | 90% | £1,295 | |
| 7 | Smart (mcc) Fortwo(2014) | 87% | £1,340 | |
| 8 | Skoda Roomster(2015) | 85% | £1,340 | |
| 9 | Kia Rio(2015) | 84% | £1,340 | |
| 10 | Fiat Ducato(2009) | 84% | £1,340 |
Frequently Asked Questions
Are diesel cars still worth buying in 2026?
For high-mileage drivers doing 15,000+ miles per year, diesel remains the most fuel-efficient option for long motorway runs. For urban-only driving under 10,000 miles, petrol or electric is typically cheaper and avoids DPF issues from short trips.
What are common diesel MOT failures?
The most common diesel-specific failures are emissions (often caused by a blocked DPF), EGR valve faults, and turbo issues. Cars used mainly for short journeys are most at risk because the DPF never gets hot enough to self-clean.
Is diesel cheaper than petrol to run?
It depends on mileage. Diesel costs more per litre (148p vs 142p) but goes further per gallon. At 7,400 miles/year (UK average), small petrol cars are typically cheaper overall. Above 12,000 miles, diesel starts to win on fuel costs alone.
Can I check a specific diesel car before buying?
Yes. Enter any reg plate into our free car check to see its full MOT history, including any DPF or emissions advisories, mileage verification, and a personalised running cost estimate.
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Best Petrol Cars
Petrol models ranked by reliability and cost
Best Electric Cars
EV rankings by pass rate and running costs
Reliability Rankings
All cars ranked by MOT pass rate
Methodology
Rankings are based on DVSA MOT test data. Only diesel models with 1,000+ tests are included for statistical reliability. Fuel costs assume 148p/litre diesel and 7,400 miles/year (UK average). Road tax based on registration year. Repairs predicted from MOT pass rate. Insurance excluded. Data sourced under the Open Government Licence v3.0.